Piston gauge



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John j?. 315167? op 5? g, l A ellilo'cumgf4 Patented May 5, 1931 z Y N UNITED. STATES PATENT OFFICE JOHN n. BISHOP, orfWA'rnRLoo, IOWA PISTON GAUGE Application led May 14,

mal aberrations which may require correc.

tion, and whereby the amount of the aberrations may be quickly determined.

This object I have accomplished by the means which are hereinafter described and claimed, and which are illustrated in the v -ture from right to left within which is fitted' accompanying drawings, in which Fig. 1 is a eide elevation of my improved gauge, with elements thereof in longitudinal centralsection or broken away. Fig. 2 is a Vfront elevation of the device, and Fig. 3 is a top plan of the upper end of the Vstandard part only of the device.

It is to be understood that slight modifications of my device are nevertheless covered by the scope of my invention and lof the appended claims. t

The pistons of internal combustion cngines, because of their somewhatunbalanced actions and other causes, are subject to uneven peripheral wear which from time'to time makes it requisite that they-be demounted, and the degree of aberration from correct shape determined, before the correction of the same.

This determination has been heretofore difficult and requiring much manipulation and measuring and it is therefore my object to simplify the gauging of the piston for rapid and correct measurements of the aberration. y

The numerall denotes the relatively wide and rectangular base of the device from one end of which spaced standards 2 project upwardly in parallel and at a right angle to the base integrally to terminateat the same height therefrom, the intermediate slideway space 3 being closed Vat the top bya fitted block 5 secured by means of end screws 6. The inner faces of the standards 2 have at the left vertical rectangular facing grooves 4. The terms right or left usedherein are 1928.." Serial No. 277,450.

to lindicate either the right or `the left hand sides respectively of Fig. 1, as seen Vbyan observer'. y y Y -V t The interspace 3 servesas a vertically disposed slideway fora head block 7 whose right to left parts 8 and 9 are widened `by op- -positely projecting flanges, the flanges ofthe part 8 contacting with theright-hand `faces of the standardsQ, the flangesQ being. slidingly seated in said facing grooves 4:, whereby the block 5l is retained against displacements in any position of. vertical adjustment in the space 3.

The block 7 has a central cylindrical aperiixedly the rioht end of a hollow cylinder 10, the latter thus being maintained securely in a horizontal and parallel position relativeto the base block 1 and the upper plane surface of the latter. Apertures or ball seats 14 are ,placed in space longitudinal relations along the cylinder or tube 10 and balls 15 are mounted therein loosely so as to be movable radially more or less partially without the tube.

Y The numeral16 denotes one of a plurality ofV alined elementsA being adjusting pressure bodies for seating within the inner bore 111. of the tube 10 and which have respectively conedv end parts which fit terminally into central end sockets in the other bodies 16 Ato y the rear to aline the bodies while transmitting pressure displacements within the tube tothe bodies simultaneously. An adjusted pressure is supplied upon the right-hand body 16. by means of a headless screw 12 mounted in interior4 threads" 13 in the right-hand part of said tube to Contact at the rear with the righthand body 16'. The longitudinal displacements of the bodies 16 simultaneously -will cause their coned ends to more or less displace the balls 15 outwardly as maybe necessary.-

Y When the wrist-pin has beenremoved from .its bushing in a piston to be gauged, thergauge .standing erectras. shown in Fig'l, the tube 10 isseated inthe wrist-pin bushin `byslidture of said head-block to project in parallel relation With respect to and overy the base member, and clutch-devices mounted movably and lockingly in the apertures of the tubular member to releasably secure it coaXially in a piston aperture, and adjustably movable means mounted in said tubular member to engagingly displace said Clutch-devices laterally relatively to the tubular member.

In testimony whereof I aftix my signature.

JOHN It. BISHOP.

of such divergence may be readily and rapidly measured by any suitable interposed appliance preliminary to truing up such wall.

This gauge thus becomes of importance in garage and repair shops as Well as other places Where ease and speed of gauging is required in the handling of the days Work.

Itrwill be seen, that the balls 15 are so relatively arranged that tivo pairs in alinement and differently spaced longitudinally may be separately used in contacts with i the bushaving described my invention, what I claim as new, and desire to secure by Letters Patent, is:

1. In a gauge, a base member, a. longitudiings of pistons of different diameters.

nally slotted standard fixed perpendicularly upon said base member, a tubular member having a rectangular head mounted slidably in the slot of said standard, said tubular member havinglr opposite laterally opening apertures, and clutch-devices mounted in the apertures in said member for movements to project Without said tubular member.

2. In a` gauge, a base member, a. longitu* dinally slotted standard fixed perpendicularly on one end of said base-member, a tubular member positioned in parallel relation with respect to and above said base member and having a rectangular head slidably mounted in the slot of said standard, said head. being grooved on opposite sides to fit the slot in said standard to lock it thereon against other thanV sliding displacements', said tubular member having lateral apertures, clutch balls mounted to move laterally of said tubular member in said apertures, and means in said tubular member to engage said balls to propel them partially outwardly to engage the inner Wall of a Wrist pin bushing of a iston removably seated on the tubular mem er.

3. In a gauge, a base member, a longitudinally slotted standard integral With and perpendicular to one end of said base member, said slot extending through the outer end of said standard, an end-closure removably secured in the outer end of the slot, an apertured head-block mounted in said slot to slide lengthwise thereof Without other displacement therefrom, an apertured tubular member having one end fixed in the aper- 

